Brake



l Feb. 23, 1932. E. v. TAYLOR 1,846,161

BRAKE Filed April 11. 1929 2 Sheets-Sheet 1 INVENTok EBlYJGENE V. TAYLOR A ORNEY Feb. 23, 1932. E. v. TAYLOR 1,846,161

BRAKE Filed lApril 11, 1929 2 Sheets-Sheet 2 INVENTOR guaina V. TAYLOR Y wat A TTORNE Y i Patented Feb.l 23, 1932 UNITED STATES PATENT oFFlcE EUGENE V. TAYLOR, OF CHICAGO, ILLINOIS, ASSIGNOR TO BENDIX BRAKE COMPANY,

' 0I SOUTH BEND, INDIANA, A CORPORATION OF ILLINOIS BRAKE Application led April 11,

This invention relates to brakes and is illustrated as embodied in' an internal expanding brake for an automobile wheel.

An object of the invention is to provide a brake of this type employing a plurality of connected shoes or equivalent friction means and to actuate said shoes into drum engagement by a novel floating cam having a Wedging engagement with the shoes and which lis rotatable about an aX'is which is parallel to the plane of friction elements.

il further object of the invention c1 ntefrn plates the provision of anovel bracket or bearing support for the rotatable cam, which bracket is provided with spaced ears or flanges through which is passed a pivot pin upon which the cam rotates, the bracket also being supported by a single pivot pin about which it rotates. i

A further feature of the invention resides in the combination of my novel cam with a enible control element anchored thereto, which Hexible element enables the cam to float, while performing its functionof rotating the cam and thus equalize the pressure applied to the friction elements. f

Various other features of my invention reside in the specific mounting of the rotatable cam; in thespecific details of the cam per se; in the details of the flexible control, and to various other features of construction and combinations of arts-which will become apparent from the following detailed description of certain preferred embodiments of my invention illustrated in the` accompanying' drawings, in which Figure 1 is a vertical sectional view of an internal brake employing my novel cam applying structure, which section is taken through the brake drum just inside the head thereof;

. Figures 2 and 3 are sections through the *pplying means taken respectively on the lines 2-2 and 3-3 of Figure 1;

Figure 4 is a fragmentary view similar to Figure 1 indicating a modified form of my invention; and

Figures 5 and 6 are sectional views detail ing the modified form of applying meansi 1929. Serial No. 354,210.

shown in Figure 4 and taken respectively on lines 5-5 and 6-6 of said figure.

In that embodiment of my invention illustrated in Figures 1, 2 and 3 there is disclosed the usual brake drum l() secured to a rotat` Adiate the spaced apart ends of the shoes. Re-

turn springs 20 and 22 serve to return the shoes to their inoperative Iposition upon release of the applying means.

As clearly disclosed in Figures 2 and 3, I have provided a novel tWo-lobed cam 24, each lobe adapted to wedgingly engage a fiat thrust -plate 26 at the end of each T-sectioned -bralre shoe. The cam is arranged to move about an axis which is substantially perpendicular to the ground and parallel to the backing late and to this end I provlde an irregular y-shaped cam carrier bracket 28 pivotally secured to the backing plate 12 by a single bolt 30 and provided with laterally projecting spaced ears 32 and 34 serving as bearings for a pivot pin 35 passing therethrough and also through the longitudinal center of the aforementioned cam.

A flexible steel ribbon 36 is preferably employed to rotate the cam to spread the shoes `into drum engagement, which ribbon may lie Within a circular recess or groove 38 in the side face of the cam and which may be an-V chored to the cam at its end by anchor plate 40, an anchor screw 42 passing through both plate and ribbon into the body of the cam.- The flexible ribbon 36 is wound around the cam and passes out of the brake through a fiared opening in the carrier bracket all as clearly disclosed in Figure 2.

In operation with rotation of the cam about its vertical axis the shoes are spread apart into drum engagement, the pressures to the respective shoes being equalized by the floati ing characteristic of the pivotally supported cam carrier bracket.

. erall Passin now to that embodiment ofmy ina pivot .pin or spindle 48 extending through connected by suitable iixturesto'the brake Y the brake mounted upon a the longitudinal center of the cam substann', tially parallel to the backing plate and ground and journaled in bearings formed by the sides of the bracket.

The cam may be tapered as clearly shown in Figure 6 to contact, upon revolution thereof, beveled projections on thrust plates on the ends of the spaced apart brake shoe members 52 and 54. The cam is preferably rotated into engagement with the friction elements of the brake by means of a flexible cable 56 wrapped about the cam within a groove therein and anchored at its end to a 'conical plug 58 secured to the body of the cam by a screw 60 passing through the plug and a conical reinforcing sleeve therefor. The anchor plug and its sleeve may be seated within a suitably shaped recess in the cam as disclosedv in Figure 5.

In operation, pull upon the cable serves to rotate the cam against the resistance of return spring 62 secured to the shoes. The shoes are spread apartby the wedging action of the tapered cam face', the applying pressures to the two shoes being equalized-by virture of the pivoting of the carrier bracket about pivot pin 64 securing the bracket to the backing plate. Leaf springs 66 may be bracketed to the backing plate at 68, which springs function to supplement the action of the return spring 62 inreturning the shoes and cam to their inoperative positions.

In both modications ofmy invention, the

cam is rotated by the flexible cable which is servicepedal, the cable passing through a iared itting 62 in the backin plate. With ont or other dirigible wheel axle roll, steering movement Y A and chassis movement taken up by the springs are all compensated for by the flexible control tension element operating Vmy novel brake.- The flexible control whether ribbon or cable also permits the floating of the cam those' particular emb to equalize the applying preures to the two shoes.

While .several illustrative embodiments have been described in detail, it is not my in ction elements within the drum su ported by said plate and applying means or said elements comprising a floating bracket member rotatably supporting a cam movable about an axis substantially parallel to the plane of said support plate. v

2. A brake comprising, in combination, a

rotatable drum and a stationary brake sup-- port plate at the open side of said drum, friction elements within the drum supported by' said plate and applying means for said elements comprising a floating bracket member rotatably supporting a cam movable aboutan y axis substantially parallel to the plane of said support plate, in combination with a Y flexible tension element anchored to said cam and ada ted to rota-te the same.

3. A Y rake comprising, in combination, spaced apart'friction elements actuated by a rotatable cam arranged to spread said ele-4 ments apart to apply the brake, said cam being mounted on a spindle journaled within bearings ina pivotally mounted bracket member, in combination with a flexible tension element anchored to said cam and arranged to actuate the same.

4. A brake structure having a stationary support plate, in combination with a bracket' i passing through said plate and connected to .y

y,member pivotally mounted thereon, said bracket provided with vertically arranged spaced. bearings journaling the spindle of a cam member, whereby said cam may rotate about a radially extending axis'substantially parallel to/the plane of said support.

7. Operating mechanism for a brake comprising a support plate having -a bracket member pivotally mounted thereon, said bracket provided with vertically arranged spaced bearings journaling the spindle o'f a cam member, whereby said cam may rotate about a radially extendin axis substantially bination with a flexible ribbon member parallel to the plane of said support, in com-l wrapped about the cam and anchored thereto.

perating mechanism for a brake comprising a bra e support plate, a two-lobed cam rotatably supported by a floating carrier to said cam and wound aboutand seated within a groove in said cam.

9. Operatin mechanism for a brake comprising a bra e support plate, a two-lobed 5 cam rotatably supported by a floating carrier bracket and movable about an axis substantially parallel to said Plate, in combination with operating means or said cam comprising a flexible flat ribbon member anchored 10 to said cam and wound about and seated within a channelgroove in said cam, said bracket extended to crm a bearing for said ribbon member.,

l0. perating mechanism for a brake Suplw ported on a stationary plate member comprising, in combination,.a recessed bracket member housing a cam element rotatable within said recess, said cam characterized by its tapered body which resents inclined ao side faces to driven means apted to contact therewith.

l1. Operating mechanism for a brake su ported on a stationary backing plate inclu ing-a recessed bracket member pivotally su l 26 ported by said plate, said bracket rotatab y ment o supporting a cam housed within said recess and movable about an axis substantially parallel to said backing plate. l

12. Operating mechanism for a brake su ao ported on a stationary backing plate inclu lng a recessed bracket member piivotally supported by said plate, said brac et rotatab y supporting a generally cylindrical cam housed within said recess and movable about an axis le substantially parallel to said backing plate,

said cam resenting inclined side faces to elements to actuated thereby.

13. In combination, a brake drum, shoes to eng the drum, expanding means teef- 40 fect sai engagement, carrier means rotatably sup rting sald expanding means, a pivot for sai carrier, U-shaped spring means having arms engaglng opposite faces of said carrier. wherebfy said spring is tensioned by movesaid carrier about its pivot. 14. In combination, a brake drum, shoes to ge the drum, expanding means to effect said en gement, a carrierrotatably supporting sal expanding means, a pivot to permitv so said'carrier to swing and carry saldexmqaad-l ing means bodil while the latter 1s act1ng to ex and said oes, said carrier having op-- faces, U-sh ringmeansha arms engaging sai faces whereby whensai 53 carrier turns on its pivot itso posed faces expand the said sprin arnisgn whereby the energy thereby infthe spring functions to restore the carrier to centralized 'tion.

l Inl testimony whereof, I- have ereunto Am, signed my name. Y y

, EUGENE V. TAYLOR. 

